Tuesday, October 13, 2009

Guest Lecture Christopher Davey

The lecture started with two important points. First what are the renewable energy resources and what is the Enviro Mission in the 21 century. Renewable energy is energy produced from natural resources like sunlight, wind, rain, soil. “In 2006 around 18% of global final energy consumption came from renewable energy resources plus 13% from traditional biomass (wood-burning). The next largest renewable source is hydroelectricity which presents 3% of global energy consumption and 15% of global electricity generation. The Enviro Mission Global Solar is a tower developer who is established network of global partners and doing projects underway in the southwest. One of their big projects is a solar updraft tower power generating station recognized as “Solar Tower Buronga” in Buronga, New South Wales which started in 2001.” The height of the tower will be approximately twice as the world’s tallest structure.

The renewable energy resources have different benefits included 100% green resources with zero water, zero emission, zero fossil fuel, more reliable cost, more flexibility on hours to operate and site flexibility. Some of the technologies in renewable energy are nuclear, wind, photovoltaic and solar power. But need to consider that on top of the advantage they have disadvantage. Although nuclear power has a very high capital costs it has long development lifecycle and politically sensitive. Wind power doesn’t have a storage capability and really unreliable but the caption cost is moderate on that. Photovoltaic also has an extremely high caption cost with very expensive to install, expensive to storage and it just can operate 4 to 6 hours per day. Finally solar power is not economical in storage with high caption cost and can just operate 6 to 8 hours per day.

The attractive part in the lecture was solar tower section. Solar tower is a projected type of renewable-energy power plant. In fact it is a combination of three old and established technologies like chimney outcome, greenhouse outcome, and wind turbines. The producing skill of the solar tower mainly depends on two different factors. First the size of the tower such as collector size and chimney height and second the volume of air which needs to get warmed to run up to the chimney.

The solar tower has a big advantage over wind powers and other solar producer. The solar tower is based on no wind program and can work 24 hours and 7 days a week. They are also low costs with sustainable energy (zero water and fossil fuel use), it has more than 75 life expectation, integrates with variety of heat forms storage (hot air can be stored inside the collector region to be used to warm the air later on.) and being eco-energy for the 21st century. In addition, in our era solar tower can be a major motivated option in energy projects since it has lots of advantages compare to other developments.

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